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Don't lose SE indexed pages

[SeoPromoter]

Hello!

I have a site in html, it has 65 indexed pages in Google. We will redesign the site changing the pages extension from html to php.

For example, index.htm ---> index.php.
index.htm is indexed in google while index.php isn't.

Is there any way to make this chamge without losing the indexed pages? Is there any way to tell the SE which pages should visit without be banned (using redirection).

Thanks, Facundo

[2by4]

Don't change the urls/filenames at all, just run the html as php through .htaccess, that's the easiest way:

AddType application/x-httpd-php .htm .html

[SeoPromoter]

Great!

Thanks, but...
The SE don't penalyze this "change"? It's a secure way?

Thanks again

[2by4]

There is only one change, your pages will not return a last modified header like they did before, but that a result of running scripted pages, it would be the same in any case.

You can set headers to deliver the last modified date with php if you feel like it, but it really doesn't matter that much.

The search engines see nothing, same urls, same pages, same site, no difference.